One. Vertical through the apex.
7
7 horizontal lines and 10 vertical lines how many rectangles?
8
As many as you want my friend...
4
If it is lying along its length, and he cross section is, for example, a regular pentagon, then it will have no vertical lines.
24
Two
2
2
Oh, what a wonderful question! In the letter F, there are two vertical lines standing tall and proud. Just imagine those lines dancing together on the canvas, creating a beautiful and balanced letter F. Keep exploring and noticing the details around you, my friend.